When choosing a replacement gas boiler or for your new home consider choosing a condensing version; it will lower your running costs considerably. The efficiency comes from the boiler being able to extract the heat in the flue gas that is otherwise sent through to atmosphere and wasted. The boiler captures this heat and uses it to preheat the combustion air and gases to be burnt resulting in higher efficiency up to 25% more efficient than an equivalent non-condensing boiler. They will also have lower emissions of carbon dioxide. The brand of boiler we frequently install is
Non-condensing boilers are in New Zealand because we, unfortunately, buy them as an unregulated market. In overseas
There are several models and styles of efficient condensing boilers. Some called Combi boilers have
Efficient condensing gas boilers have a multitude of uses from domestic water heating through to whole home heating solutions including underfloor heating and radiator systems. Very effective in all areas and low running costs running using natural gas. LPG is efficient but has a higher cost per kilowatt than natural gas.
Hot Water Heat Pump (HPHW)
HPHW Has been around for at least the last 40 Years. With new branding and the latest technology they have evolved into a very efficient heat source, Air Source HPHW is a good option in our Bay of Plenty region because the ambient air temperature does not often go below 11 degrees.
HPHW suits tasks where high temperatures of water are not required but there is one exception (will get to that in a minute). HPHW generally work on very high efficiency till the water gets to 40 degrees Celsius, then the heat requirement input increases per degree requiring more energy with every degree to be heated, to extract maximum efficiency from HPHW suitable tasks revolving around lower temperature hot water are Underfloor Heating, Radiator Heating is possible on a smaller home with
The exception for heating water above 40 degrees
www.econergy.co.nz. Hot water heat pumps offer straight line performance all year round and offer savings for high water user families with small or large HWC where solar cannot run efficiently. These systems offer maximum convenience at
These running costs do vary depending on which power company you support and whether on controlled power or not.
The ECONERGY heat pump is able to be fitted to new installations and retrofitted to existing hot water systems.
We have made many happy clients from fitting the ECONERGY in our region and they suit people with families who use a lot of hot water. The reason for this is that it works on a thermostat and when required on demand at the same high efficiency, whereas with solar when your tank of water is used up the electric boost element kicks in, this is why small hot water cylinders do not suit solar applications.
Solar hot water heating as a Heat source has generally been over promised and oversold. The promises made by salesmen in our area in past times goes beyond the capability of physics and are an embarrassment to the industry.
However, if sized correctly like all other systems they offer very good performance. The hot water cylinder is the key to good solar performance and a good controller. The HWC acts as a thermal store or Battery – the larger the battery the more energy you can store. This is why
A typical standard system rated for a 300 HWC is rated at 2.8kw/hr on a yearly basis, a smaller system capable of heating 180
Solar is also good for pool heating but requires careful design to get the collector size and ration to pool surface area correct
There are systems that will do underfloor heating however they are very large, they will require a large thermal store up to 1000
To recap solar is very useful and still efficient heat source but requires careful design for the task at hand.